Pulling carbon dioxide out of the atmosphere can help limit the damage wrought by global warming

June 10, 2011
By Thomas E. Lovejoy 
New York Times

Carbon dioxide levels in the atmosphere are pushing 400 parts per million (p.p.m.) — up from the natural pre-industrial level of 280 p.p.m. Emissions for last year were the highest ever. Rather than drift along until a calamity galvanizes the world, and especially the United States, into precipitous action, the time to act is now.